linux-kernel - Re: [PATCH v4] serial/efm32: add new driver

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Date:	Wed, 25 Jan 2012 09:41:08 +0100
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	Joe Perches <joe@...ches.com>
Cc:	Greg KH <greg@...ah.com>, linux-kernel@...r.kernel.org,
	Alan Cox <alan@...ux.intel.com>, kernel@...gutronix.de,
	devicetree-discuss@...ts.ozlabs.org,
	Greg Kroah-Hartman <gregkh@...e.de>,
	linux-serial@...r.kernel.org
Subject: Re: [PATCH v4] serial/efm32: add new driver

On Wed, Jan 25, 2012 at 12:25:59AM -0800, Joe Perches wrote:
> On Wed, 2012-01-25 at 09:05 +0100, Uwe Kleine-König wrote:
> > Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> 
> trivial comments below:
> 
> > diff --git a/drivers/tty/serial/efm32-uart.c b/drivers/tty/serial/efm32-uart.c
> []
> > @@ -0,0 +1,830 @@
> > +#if defined(CONFIG_SERIAL_EFM32_UART_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
> > +#define SUPPORT_SYSRQ
> > +#endif
> 
> #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> 
> > +static void efm32_uart_rx_chars(struct efm32_uart_port *efm_port,
> > +		struct tty_struct *tty)
> > +{
> []
> > +		if ((rxdata & UARTn_RXDATAX_FERR) &&
> > +				!(rxdata & UARTn_RXDATAX_RXDATA__MASK)) {
> 
> Perhaps better as:
> 
> 		if ((rxdata & UARTn_RXDATAX_FERR) &&
> 		    !(rxdata & UARTn_RXDATAX_RXDATA__MASK)) {
This is how my editor does the indention. I'm sure this can be changed,
but I want the indention only to depend on the logical structure not on
where the opening parenthesis in the previous line is. This saves
context changes for future patches.
 
> and RXDATA__MASK with 2 underscores?  perhaps just one _?
Yeah, I like seperating the register bit field name from that fact that
the #define holds a mask.
 
> > +static int efm32_uart_console_setup(struct console *co, char *options)
> []
> > +		for (i = 0; i < ARRAY_SIZE(efm32_uart_ports); ++i) {
> > +			if (efm32_uart_ports[i]) {
> > +				pr_warn("efm32-console: fall back to console index %u (from %hhi)\n",
> > +						i, co->index);
> 
> 				pr_warn("fall back to ..."
> []
> > +	efm_port = efm32_uart_ports[co->index];
> > +	if (!efm_port) {
> > +		pr_warn("efm32-console: No port at %d\n", co->index);
> 
> 		pr_warn("No port at..."
I intentionally did that, as these two messages are related to the
console part of the serial driver while the rest of the messages are
about the serial/tty stuff. And I didn't like changing the definition of
pr_fmt in the middle of the file.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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